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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3406fbea2e7fb843115b1482590e123ae987ee98ace4d7ca1d6e3960f7c7656' 
  AND token = '1/wravXCpbDPIyenOSqoTLMjFskMFmSXN/N7uB/yFFs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}